<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>
  <title>所有选择器的优先级</title>
  <style>
	#d1{
		/*color:yellow;*/
	}
	.main{
		/*color:green;*/
	}
	div{
		/*color:red;*/
	}
	body{
		font-size: 12px;
	}
	span{
		font-size: 2em;
	}
  </style>
 </head>

 <body>
  <div class="main" id="d1" style="">一个<span>区</span>块</div>
 </body>
</html>
